$1 - One Helluva Goat TG/TF Comic (Patreon)

A black metal Satanist guy is trying to do a summoning as a way to get some inspiration for his next concert with the band, but as he does so he unintentionally summons a little hellgoat demon spirit that possesses him, making him become a tall, busty and muscular

She smiles as she gets a idea for the band and decides to have some fun. Seeing how her mind and the mind of the guy have merged.